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LTC3728LIGN-1

Description
IC 3 A DUAL SWITCHING CONTROLLER, 590 kHz SWITCHING FREQ-MAX, PDSO28, 0.150 INCH, PLASTIC, SSOP-28, Switching Regulator or Controller
CategoryPower/power management    The power supply circuit   
File Size466KB,32 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Download Datasheet Parametric View All

LTC3728LIGN-1 Overview

IC 3 A DUAL SWITCHING CONTROLLER, 590 kHz SWITCHING FREQ-MAX, PDSO28, 0.150 INCH, PLASTIC, SSOP-28, Switching Regulator or Controller

LTC3728LIGN-1 Parametric

Parameter NameAttribute value
Is it lead-free?Contains lead
Is it Rohs certified?incompatible
MakerLinear ( ADI )
Parts packaging codeSSOP
package instructionSSOP, SSOP28,.25
Contacts28
Reach Compliance Codenot_compliant
ECCN codeEAR99
Analog Integrated Circuits - Other TypesDUAL SWITCHING CONTROLLER
control modeCURRENT-MODE
Control TechnologyPULSE WIDTH MODULATION
Maximum input voltage28 V
Minimum input voltage4.5 V
Nominal input voltage15 V
JESD-30 codeR-PDSO-G28
JESD-609 codee0
length9.893 mm
Humidity sensitivity level1
Number of functions1
Number of terminals28
Maximum operating temperature85 °C
Minimum operating temperature-40 °C
Maximum output current3 A
Nominal output voltage3.35 V
Package body materialPLASTIC/EPOXY
encapsulated codeSSOP
Encapsulate equivalent codeSSOP28,.25
Package shapeRECTANGULAR
Package formSMALL OUTLINE, SHRINK PITCH
Peak Reflow Temperature (Celsius)235
Certification statusNot Qualified
Maximum seat height1.75 mm
surface mountYES
Switch configurationPHASE-SHIFT
Maximum switching frequency590 kHz
technologyCMOS
Temperature levelINDUSTRIAL
Terminal surfaceTin/Lead (Sn/Pb)
Terminal formGULL WING
Terminal pitch0.635 mm
Terminal locationDUAL
Maximum time at peak reflow temperature20
width3.899 mm
FEATURES
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LTC3728L-1
Dual, 550kHz, 2-Phase
Synchronous Regulator
DESCRIPTION
The LTC
®
3728L-1 is a dual high performance step-down
switching regulator controller that drives all N-channel
synchronous power MOSFET stages. A constant frequency
current mode architecture allows phase-lockable frequency
of up to 550kHz. Power loss and noise due to the ESR of
the input capacitors are minimized by operating the two
controller output stages out of phase. The LTC3728L-1
is identical to the LTC3728L except that the LTC3728L-1
lacks the over current latchoff feature.
OPTI-LOOP compensation allows the transient response to
be optimized over a wide range of output capacitance and
ESR values. The precision 0.8V reference and power good
output indicator are compatible with future microproces-
sor generations, and a wide 4.5V to 28V (30V maximum/
35V for LTC3728LI-1) input supply range encompasses
all battery chemistries.
A RUN/SS pin for each controller provides soft-start.
Current foldback limits MOSFET dissipation during short-
circuit conditions. The FCB mode pin can select among
Burst Mode operation, constant frequency mode and
continuous inductor current mode or regulate a secondary
winding. The LTC3728L-1 includes a power good output
pin that indicates when both outputs are within 7.5% of
their designed set point.
L,
LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
Burst Mode and OPTI-LOOP are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Protected by U.S. Patents including 5929620, 6177787, 6144199, 5471178, 5994885, 6100678.
Dual, 180° Phased Controllers Reduce Required
Input Capacitance and Power Supply Induced Noise
OPTI-LOOP
®
Compensation Minimizes C
OUT
±1.5% Output Voltage Accuracy
Power Good Output Voltage Indicator
Phase-Lockable Fixed Frequency 250kHz to 550kHz
Over Current Latchoff Disabled
Wide V
IN
Range: 4.5V to 28V (35V for LTC3728LI-1)
Operation
Very Low Dropout Operation: 99% Duty Cycle
Adjustable Soft-Start Current Ramping
Foldback Output Current Limiting
Output Overvoltage Protection
Low Shutdown I
Q
: 20μA
5V and 3.3V Standby Regulators
3 Selectable Operating Modes: Constant Frequency,
Burst Mode
®
Operation and PWM
5mm
×
5mm QFN and 28-Lead Narrow SSOP
Packages
APPLICATIONS
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Notebook and Palmtop Computers
Telecom Systems
Portable Instruments
Battery-Operated Digital Devices
DC Power Distribution Systems
TYPICAL APPLICATION
+
4.7μF
M1
L1
3.2μH
D3
V
IN
PGOOD INTV
CC
TG1
TG2
C
B1
, 0.1μF
BOOST1
SW1
BG1
f
IN
500kHz
PLLIN
SENSE1
+
R
SENSE1
0.01Ω
V
OUT1
5V
5A
1000pF
SENSE1
V
OSENSE1
I
TH1
C
SS1
0.1μF
SENSE2
V
OSENSE2
I
TH2
C
SS2
0.1μF
LTC3728L-1
BOOST2
SW2
BG2
PGND
SENSE2
+
1000pF
D4
1μF
CERAMIC
M2
V
IN
5.2V TO 28V
C
IN
22μF
50V
CERAMIC
L2
3.2μH
C
B2
, 0.1μF
R
SENSE2
0.01Ω
V
OUT2
3.3V
5A
+
R2
105k
C
OUT1
1%
47μF
6V
SP
M1, M2: FDS6982S
R1
20k
1%
C
C1
220pF
R
C1
15k
RUN/SS1 SGND RUN/SS2
C
C2
220pF
R
C2
15k
R3
20k
1%
R4
63.4k
1%
C
OUT
56μF
6V
SP
+
3728l1 F01
Figure 1. High Efficiency Dual 5V/3.3V Step-Down Converter
3728l1fc
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